Haven’t seen that enclosure before, but as it encloses a speaker that is designed to radiate in a 360 degree circle, I’d be suspect about its efficacy.
And without knowing what speakers are connected to the Amp, it’s hard to make a value judgement between the two.
I wondered that too about the 360 sound, but if you look at the exploded view of the Era 100s, it looks like they only cover about 120 degrees
I would be comparing them to the Sonos amp and 8” in ceiling speakers.
I can’t provide answers, since I’ve never seen this mount before. Which 8 inch in-ceiling speakers?
The Sonos (really Sonance) speakers. Sonos ceiling speakers
My expectation (not having heard either) is that the 8” Sonos/Sonance would put out a lot more sound than the 100.
Since you’d have both mounted in the ceiling the usual advantage of the 100, being properly positioned for best imaging doesn’t apply.